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OK I took my breather apart and sure enough just an empty box. I took it apart and found no problems with it. In addition I couldn't find any use for the orange diaphragm. At least in the BMW application this valve does not appear to do anything at all. The port on the chamber which sucks the valve open is not connected in our engines and appears to have no function.
The new breather I purchased was the cyclone type. I took the cyclone apart to find it is just a collection of plastic parts.I fitted the cyclone into the new housing and it does appear to have made a difference. Previously I could feel a very slight suction from the dipstick at idle whereas now it seems fairly neutral. It definitely smokes less at idle. Its too early to tell if it has cured oil consumption. I have tried different oil before and it didn't make much difference but I can use any oil as I am not running with a dpf.
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